I enter pounds in the PDCS and not kilograms, so I end up with different EPR and Mach/IAS than you get. I have found that when I compare the Vref info, if I used lower numbers than what I get, e.g. 40/137, 30/142 & 15/148 with a ZFW of 82070 lbs, that I would not want to go much slower than the recommended Vref numbers or I will fall out of the sky.

@Captain Sim. Does the PDCS use values dependent on you FSX settings: US System (feet and inches) or Hybrid (feet and milibars) when it comes the weight you use for ZFW? :-?

Mark